Question

31

AL Figure P9.28 it 29. A sample of an unknown material appears to weigh 300. N in air and 200. N when immersed in alcohol of specific grav- ity 0.700. What are (a) the volume and (b) the density of the material 30, An object weighing N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 265 N. Immersed in oil, the o object appears to weigh 275 N. Find (a) the density of the object and (b) the den- sity of the oil. s. 31. A 1.00-kg beaker containing 200 kg of oil (density 916 kg/m2) rests on a scale. A y 2.00-kg block of iron is suspended from a spring scale and is completely submerged in the oil (Fig. P9.31). Find the equilib- rium readings of both scales. Figure P9.31 y 9.6 Fluids in Motion 9.7 Other Applications of Fluid Dynamics 32. A horizontal pipe narrows from a radius of 0.250 m to 0.100 m. If the speed of the water in the pipe is 1.00 m/s in the larger- radius pipe, what is the speed in the smaller pipe? 33. A large water tank is 3.00 m high and filled to the brim, the top of the tank open to the air. A small pipe with a faucet is attached to the side of the tank, 0.800 m above the ground. If the valve is opened, at what speed will water come out of the pipe? 34. Water flowing through a garden hose of diameter 2.74 cm fills a 25.0-L. bucket in 1.50 min. (a) What is the speed of the water leaving the end of the hose? (b) A nozzle is now attached to the end of the hose. If the nozzle diameter is one-third the diameter of the hose, what is the speed of the water leaving the nozzle? 35. BIO (a) Calculate the mass flow rate (in grams per second) s of blood (p 1.0 g/cm) in an aorta with a cross-sectional

Answer 1

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